Kids Love Rocks - A guide to rock collecting
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Obsidian Arrowhead

Obsidian Arrowheads

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Obsidian

 

Obsidian is an igneous rock that is formed when volcanic lava cools without crystal growth.  The result produces a black stone with a very glassy texture.  Obsidian is mostly silicon dioxide. 

Because Obsidian could be fractured and worked into weapons, it was highly valued in the stone ages. 

 

 

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